[DiapDealer]

Popup footnotes on the Paperwhite usually "just work" as long as you code your foot|end notes in a standard--very basic way in your source epub. Of course they're only going to work with the newer KF8 format, and you will probably have to use kindlegen/previewer to build the kindlebook. I could be wrong about the kindlegen/previewer part, though, as I believe the pop-up note (non-epub3 "aside" variety) is more of a heuristic feature/function of the Paperwhite device than anything.